Television – Bandwidth reduction system – Data rate reduction
Patent
1997-06-24
1999-11-09
Tung, Bryan
Television
Bandwidth reduction system
Data rate reduction
348401, 348403, 382248, H04N 712
Patent
active
059824352
ABSTRACT:
An image encoding method and apparatus, an image decoding method and apparatus, and an image recording medium are provided for suppress the diffusion of the quantizing noise components of the wavelet coefficient or the subband coefficient caused by the band division with the wavelet filter or the subband filter and the quantization, thereby narrowing the area where the ringing takes place. The image encoding method is arranged to detect a motion vector from an input image signal, derive a difference between the input image signal and a predicted image signal, detect a meaningless area from the difference image signal and output information about the meaningless area; subband-convert the difference image signal for outputting a subband coefficient, quantize the subband coefficient, de-quantize the quantized subband coefficient, invert the decoded subband coefficient for outputting a decoded difference image signal, smooth the decoded difference image signal based on the information about the meaningless area, add the predicted image signal to the smoothed difference image signal for producing a decoded image signal, motion-compensate the decoded image signal with the motion vector for outputting the predicted image signal, and output the quantized subband coefficient, the information about the meaningless area, and the motion vector as encoded data. The decoding method takes the substantially reverse operation as the encoding method.
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Miyahara Nobuyoshi
Ogata Masami
Suzuki Teruhiko
Tong Tak Yen
Frommer William S.
Sony Corporation
Tung Bryan
Vo Tung
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